From: Bertram Scharpf <lists@...>
Date: 2006-03-15T06:04:46+09:00
Subject: Re: Proposal: String#notempty?

Am Dienstag, 14. M�r 2006, 12:02:45 +0900 schrieb nobu@ruby-lang.org:
> At Tue, 14 Mar 2006 04:37:43 +0900,
> Bertram Scharpf wrote in [ruby-core:07536]:
> > > unless string.empty?
> > 
> > How do you make the unless modifier return a string?
> 
> string[/.+/mn] || "default"

puts RUBY_VERSION

require "benchmark"

class String ; def ne? ; empty? ? nil : self ; end ; end

a = "stuff ".split nil, -1
a.each { |s|
  Benchmark.bm { |x|
    x.report("c") { 1_000_000.times { s.nonempty? || "default" } }
    x.report("d") { 1_000_000.times { s.ne?       || "default" } }
    x.report("a") { 1_000_000.times { s.any?   ? s : "default" } }
    x.report("e") { 1_000_000.times { s != ""  ? s : "default" } }
    x.report("n") { 1_000_000.times { s[/.+/mn]   || "default" } }
  }
}

----

1.9.0
      user     system      total        real
c  0.480000   0.000000   0.480000 (  0.477972)
d  0.870000   0.000000   0.870000 (  0.871681)
a  2.630000   0.000000   2.630000 (  2.625230)
e  1.280000   0.000000   1.280000 (  1.278209)
n  2.220000   0.000000   2.220000 (  2.227200)
      user     system      total        real
c  0.860000   0.000000   0.860000 (  0.851721)
d  1.260000   0.000000   1.260000 (  1.264583)
a  1.680000   0.000000   1.680000 (  1.674639)
e  1.020000   0.000000   1.020000 (  1.021995)
n  1.420000   0.000000   1.420000 (  1.420242)

----

class String
  def complexity
    scan(/\w+|./).uniq.length
  end
end

puts <<EOT.split($/).map { |c| c.complexity }
s.notempty? ||
s.ne?       ||
s.any?   ? s :
s != ""  ? s :
s[/.+/mn]   ||
EOT

----
6
6
6
7
9
----

Bertram


-- 
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-scharpf.de